Portable telephone



FIG. 1 is a front, elevational view showing our new design for a portable telephone in full lines;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left elevational view thereof; and,

FIG. 6 is a right elevational view thereof. 

The ornamental design for a portable telephone, as shown and described. 